Air diffuser



FIG. 1 is a perspective view of an air diffuser, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is side elevation view thereof;

FIG. 5 is another side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings depict portions of the air diffuserthat form no part of the claimed design.

CLAIM The ornamental design for an air diffuser, as shown and described.